feat: add automatic list continuation in prompt input

packages/opencode/src/cli/cmd/tui/component/list-continuation.ts

@@ -0,0 +1,153 @@
+/**
+ * Hook for automatic list continuation in textarea inputs.
+ *
+ * When pressing newline on a numbered list line:
+ * - If line has content (e.g., "1. foo"), inserts next number on new line
+ * - If line is empty (e.g., "1. "), clears the list marker instead
+ */
+
+// Matches a numbered list line with content after the marker
+// Examples: "1. foo", "12. bar", "3.  baz"
+const NUMBERED_LIST_WITH_CONTENT = /^(\d+)\.\s+\S/
+
+// Matches a numbered list line with only whitespace after the marker (or nothing)
+// Examples: "1. ", "2.  ", "3."
+const NUMBERED_LIST_EMPTY = /^(\d+)\.\s*$/
+
+export type ListContinuationAction =
+  | { type: "continue"; insertText: string }
+  | { type: "clear"; deleteRange: { start: number; end: number }; cursorPosition: number }
+
+export type LineInfo = {
+  start: number
+  end: number
+  text: string
+}
+
+/**
+ * Gets information about the line containing the cursor.
+ */
+export function getCurrentLine(text: string, cursorOffset: number): LineInfo {
+  // Find line start by looking backward for newline
+  let start = cursorOffset
+  while (start > 0 && text[start - 1] !== "\n") {
+    start--
+  }
+
+  // Find line end by looking forward for newline
+  let end = cursorOffset
+  while (end < text.length && text[end] !== "\n") {
+    end++
+  }
+
+  return {
+    start,
+    end,
+    text: text.slice(start, end),
+  }
+}
+
+export type ParsedListItem = {
+  number: number
+  hasContent: boolean
+}
+
+/**
+ * Parses a line to determine if it's a numbered list item.
+ */
+export function parseNumberedListItem(lineText: string): ParsedListItem | null {
+  // Check for numbered list with content
+  const withContent = lineText.match(NUMBERED_LIST_WITH_CONTENT)
+  if (withContent) {
+    return {
+      number: parseInt(withContent[1], 10),
+      hasContent: true,
+    }
+  }
+
+  // Check for numbered list without content (empty item)
+  const empty = lineText.match(NUMBERED_LIST_EMPTY)
+  if (empty) {
+    return {
+      number: parseInt(empty[1], 10),
+      hasContent: false,
+    }
+  }
+
+  return null
+}
+
+/**
+ * Determines what action to take when newline is pressed.
+ *
+ * @param text - The full text content
+ * @param cursorOffset - The current cursor position
+ * @returns Action to perform, or null to use default newline behavior
+ */
+export function handleNewline(text: string, cursorOffset: number): ListContinuationAction | null {
+  const line = getCurrentLine(text, cursorOffset)
+  const parsed = parseNumberedListItem(line.text)
+
+  // Not a numbered list - use default behavior
+  if (!parsed) {
+    return null
+  }
+
+  // Only apply list continuation when cursor is at end of line
+  if (cursorOffset !== line.end) {
+    return null
+  }
+
+  if (parsed.hasContent) {
+    // Line has content - continue the list with next number
+    const next = parsed.number + 1
+    return {
+      type: "continue",
+      insertText: `\n${next}. `,
+    }
+  }
+
+  // Line is empty (just the list marker) - clear the line
+  return {
+    type: "clear",
+    deleteRange: { start: line.start, end: line.end },
+    cursorPosition: line.start,
+  }
+}
+
+/**
+ * Removes trailing empty list items from text before submission.
+ * For example, "1. foo\n2. " becomes "1. foo"
+ *
+ * @param text - The full text content
+ * @returns Cleaned text with trailing empty list items removed
+ */
+export function cleanupForSubmit(text: string): string {
+  const lines = text.split("\n")
+
+  // Work backwards, removing trailing empty list items
+  while (lines.length > 0) {
+    const last = lines[lines.length - 1]
+    const parsed = parseNumberedListItem(last)
+
+    // If last line is an empty list item, remove it
+    if (parsed && !parsed.hasContent) {
+      lines.pop()
+      continue
+    }
+
+    break
+  }
+
+  return lines.join("\n")
+}
+
+/**
+ * Hook that provides list continuation functionality for textarea inputs.
+ */
+export function useListContinuation() {
+  return {
+    handleNewline,
+    cleanupForSubmit,
+  }
+}

packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx

@@ -31,6 +31,7 @@ import { DialogAlert } from "../../ui/dialog-alert"
 import { useToast } from "../../ui/toast"
 import { useKV } from "../../context/kv"
 import { useTextareaKeybindings } from "../textarea-keybindings"
+import { useListContinuation } from "../list-continuation"
 import { DialogSkill } from "../dialog-skill"
 
 export type PromptProps = {
@@ -87,6 +88,10 @@ export function Prompt(props: PromptProps) {
   }
 
   const textareaKeybindings = useTextareaKeybindings()
+  const listContinuation = useListContinuation()
+
+  // Filter out newline from keybindings so we can handle it in onKeyDown with list continuation
+  const promptKeybindings = createMemo(() => textareaKeybindings().filter((b) => b.action !== "newline"))
 
   const fileStyleId = syntax().getStyleId("extmark.file")!
   const agentStyleId = syntax().getStyleId("extmark.agent")!
@@ -516,7 +521,14 @@ export function Prompt(props: PromptProps) {
     if (props.disabled) return
     if (autocomplete?.visible) return
     if (!store.prompt.input) return
-    const trimmed = store.prompt.input.trim()
+
+    // Clean up trailing empty list items before submitting
+    const cleaned = listContinuation.cleanupForSubmit(store.prompt.input)
+    if (cleaned !== store.prompt.input) {
+      setStore("prompt", "input", cleaned)
+    }
+
+    const trimmed = cleaned.trim()
     if (trimmed === "exit" || trimmed === "quit" || trimmed === ":q") {
       exit()
       return
@@ -533,7 +545,7 @@ export function Prompt(props: PromptProps) {
           return sessionID
         })()
     const messageID = Identifier.ascending("message")
-    let inputText = store.prompt.input
+    let inputText = cleaned
 
     // Expand pasted text inline before submitting
     const allExtmarks = input.extmarks.getAllForTypeId(promptPartTypeId)
@@ -808,12 +820,31 @@ export function Prompt(props: PromptProps) {
                 autocomplete.onInput(value)
                 syncExtmarksWithPromptParts()
               }}
-              keyBindings={textareaKeybindings()}
+              keyBindings={promptKeybindings()}
               onKeyDown={async (e) => {
                 if (props.disabled) {
                   e.preventDefault()
                   return
                 }
+                // Handle automatic list continuation on newline
+                if (keybind.match("input_newline", e)) {
+                  e.preventDefault()
+                  const action = listContinuation.handleNewline(input.plainText, input.cursorOffset)
+                  if (action) {
+                    if (action.type === "continue") {
+                      input.insertText(action.insertText)
+                    } else if (action.type === "clear") {
+                      const before = input.plainText.slice(0, action.deleteRange.start)
+                      const after = input.plainText.slice(action.deleteRange.end)
+                      input.setText(before + after)
+                      input.cursorOffset = action.cursorPosition
+                    }
+                  } else {
+                    // No list continuation - just insert a normal newline
+                    input.insertText("\n")
+                  }
+                  return
+                }
                 // Handle clipboard paste (Ctrl+V) - check for images first on Windows
                 // This is needed because Windows terminal doesn't properly send image data
                 // through bracketed paste, so we need to intercept the keypress and

packages/opencode/src/config/config.ts

@@ -826,7 +826,7 @@ export namespace Config {
       input_newline: z
         .string()
         .optional()
-        .default("shift+return,ctrl+return,alt+return,ctrl+j")
+        .default("shift+return,ctrl+return,alt+return,ctrl+j,linefeed")
         .describe("Insert newline in input"),
       input_move_left: z.string().optional().default("left,ctrl+b").describe("Move cursor left in input"),
       input_move_right: z.string().optional().default("right,ctrl+f").describe("Move cursor right in input"),